ST_BandMetaData
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Name

ST_BandMetaData — Returns basic meta data for a specific raster band. band num 1 is assumed if none-specified.

Synopsis

(1) record ST_BandMetaData(raster rast, integer band=1);

(2) record ST_BandMetaData(raster rast, integer[] band);

Description

Returns basic meta data about a raster band. Columns returned: pixeltype, nodatavalue, isoutdb, path, outdbbandnum, filesize, filetimestamp.

[Note]

If raster contains no bands then an error is thrown.

[Note]

If band has no NODATA value, nodatavalue are NULL.

[Note]

If isoutdb is False, path, outdbbandnum, filesize and filetimestamp are NULL. If outdb access is disabled, filesize and filetimestamp will also be NULL.

Enhanced: 2.5.0 to include outdbbandnum, filesize and filetimestamp for outdb rasters.

Examples

Variant 1.

Code
SELECT
    rid,
    (foo.md).*
FROM (
    SELECT
        rid,
        ST_BandMetaData(rast, 1) AS md
    FROM dummy_rast
    WHERE rid=2
) As foo;
Output
 rid | pixeltype | nodatavalue | isoutdb | path | outdbbandnum
-----+-----------+-------------+---------+------+--------------
   2 | 8BUI      |           0 | f       |      |
(1 row)

Variant 2.

Code
WITH foo AS (
    SELECT
        ST_AddBand(NULL::raster, '/home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif', NULL::int[]) AS rast
)
SELECT
    bandnum,
    pixeltype,
    isoutdb,
    regexp_replace(path, '^.*/', '') AS file,
    outdbbandnum
FROM ST_BandMetaData((SELECT rast FROM foo),
    ARRAY[1, 3, 2]::int[]
);
Output
 bandnum | pixeltype | isoutdb |     file      | outdbbandnum
---------+-----------+---------+---------------+--------------
       1 | 8BUI      | t       | Projected.tif |            1
       3 | 8BUI      | t       | Projected.tif |            3
       2 | 8BUI      | t       | Projected.tif |            2